Vibrating safety razor with yieldably mounted blade guard



Sept 9, 1952 R. P. HARsHBr-:RGER 2,609,602

VIBRATING SAFETY RAZOR WITH YIELDABLY MOUNTED BLADE GUARD Filed Dec. 18, 1946 Patented Sept. 9, 1952 PATENT VIBRATING .SAFETY RAzo WITH YIELD. Moon-TED BLADE GUARD Russell.).11ilerollborgortSindona` .appartenga December 1s, 19.46 serial. No.. fumare:

anaemia-voorloprelalos to improvements. nfaots? rororsof the general. time e my Batont 2,362,998, osood November-21,

Y 19.44.( ooo embodying por/.or .driven for porting of; the foregoing type tlf-.1.o shaving. Pressure .1o apollo@ egaeota guar-o member whloh Yieloololy ooonootod to the cutter head soon .braoioos imparted to. the. noaa. will. @he @Utl/1.1.15 @.lmollt to roproeatoi 10.12? tudmallr Within the. anar@ mom prior structures, metallo leaf s pringl1ayepeen ein-v.

A n.191@ Spooo oloiooo is. to provide: a con necting means for the guard member whichwill provide a synchronized rebound attheendvof; each stroke` of, the cutting element, to improve the reoiprooalory aotion, andwheh will have a; lone ei'eotive life,

Other` obiots andV advantages. will become. auf. parent asf-the .dosorotoo orooeoda.

In the aompanyng drawings:

Blier. 1 is;Y a side elevational View 0f a razor ern: booyne the features ofthe present invention- Figf 2; is afragmontaryaxal. ,Seemann View takenotransversely ofnthenead end portion ofztne. razor..

' Eig, 3A is a transverse s etional ViewY taken. aloneV lino. 3..-:3A of,` .Fig-

'Fig, 4A is a fragmentary. View off tlaehead` end.. portion ofv the razor, with theoutter headln lon'gi: tudinal seotion along line 4.-,-4 offEig. 2.

Figl 5 is a fragmentary seotionalvew ofthe. cnttenhead takenalong line.4 5.-5.ofFig. 4.

Referring more particularly tothe. drawings,

astemonharzel. lvl with acuttenhead l2 mcninteel` Soloses. 1.11.--

.r1 erging., (c1. .eo-45) noaa I'Zfio adapted tor-suenen a oottiee element. sooo. tor example. come.

.opted .for oneaeomentwitlr the use Skin.- no Cooling. Il! unooros anon f 1 oloooe o power onorato@ motonpr anion? tendine to impar-ta rior-.atom or movement to the @other The 'present invention. relates. partgoolarlxr improvements. @one n the. rrwtooY produ Suitable ohorooto.. rooioroootion .between momloor I4- P-rofor lol is of tho Sarno typo eorior'allystatoi comprises an; eooontriewoient. looaoodadjacent the ooooer head? adaption toloororolveoata h' Q @or shown) onolosod with an enlargoolhousnge I6. on the. other ood, Orth St In tl tularly, the spring met atoloularohofoll 'ox axiallythfougnthofstom .l l." @other hood l2.' Thofeoc.. :weight .e @urea to one ,Sido et toe.-

o one. ortho. u lor-moons of a loaff- .Sarina e =.,..11as sunionti moos .toimpart a nronoonoesi-ey aio l t lsfformodfwth afolosedl The. barrel orfste tapered; ldf lll. constituting... th; sunnertine hase?. The other @lamenta or ofV the. .cutter head I.2^.. tho-head; lf2 generali-y comprise.- an. elongatedim.. nerblade supporting bed/'.22 and-an outencapl'.: adapted toA bergidly secured" with; the..blade. tile clampedjtherebetween tothe; stern. Il `ny==meanaotE a centrally located screw.-v 24: removably threaded. into the4 'nasek 2l. The. bed. 2,2 is of va narrowerd width than the cuttng=-e1ement orzbladeflag'and, preferably is Ulsnaped-in cross-sectionto de-.f nerspaced parallel longitudinal sideangeso The outer cap-23 is generallycrescente-shaped-n cross section so `as tof'ex theblade I3-and! maine.;

tain 'itat. the proper: cuttingangfleaeainstffthe it, and;

3 outer marginal edge surfaces of the bed 22. Longitudinally spaced pins 26 with tapered heads 21 for engagement with appropriate locating apertures in the blade I3 are secured to the bed 22 at opposite sides of the screw 24.

The guard member I4 is supported from the bed 22 through a yieldable connection for relative iloating movement, and serves to translate the normal gyratory motion of the blade I3 generally into a straight-lined reciprocatory movement. In the preferred construction, the guard member I4 comprises two spaced parallel safety bars 28 rigidly interconnected at opposite ends by cross plates 29 so as to form a rectangular frame, and extending respectievly along the opposite cutting edges of the -blade I3. It will be understood that in use, one or the other of the safety bars 28 is placed against the skin of the user and is subjected to the shaving pressure.

An important feature of the invention resides in providing a yieldable or resilient connection between the bed 22 and the guard member I4, which connection will effect the longitudinal reciprocatory motion between the guard member and the blade with a synchronized rebound, and

which in general obviates the necessity for minute accuracy in the machining and assembly of the related parts. In the preferredform, the connection consists of two strips 30 of resilient rubber which are constructed and arranged to i of the respective end plates 29 of the guard mem-v ber I 4. The outer longitudinal edge portions oi the rubber strips 3U are similarly anchored respectively to and along the inner surfaces of two end flanges 3l on the bed 22. Preferably, the

extreme outer'edge portions of the rubber ystrips- 30 arealso inset and anchored within intertting grooves 32 formed in the lower surface of the bed 22 adjacent the iianges 3l. As shown in Fig. 4, the end plates 29 are normally in edge to edge alinementwith the end flanges 3 I, but separated therefrom by a slight clearance to permit freedom of relative reciprocaticn. The rubber connectors 30 preferably are formed in their outer surfaces with longitudinal grooves 33 in substantial registration with the clearance spaces between the plates 29 and flanges 3i so as to denne lines of ilexure. It Will thus be 'seen that the rubber connectors 3i) are subject to flexure mainly in a direction longitudinally of the blade I3, vand only slightly in a transverse direction, thereby 'contralning the blade to reciprocate longitudinally relative to the guard member I4 in response to the motion producing impulses set up by the revolving eccentric weight I5.

VIt will be understood that the-action of the rubber connectors 36 in effecting the longitudinal reciprocatory motion between the guard member and the blade is dependent on the ability of the connectors to resist bending .by forces acting' transversely of the blade relative to their ability to resist bending by forces acting in a direction parallel to the cutting edge of the blade. The resistance of each connector to bending is determined in part by the shape of the connector used and more particularly by the relative dimensions of the cross section of the connector taken along a plane parallel to the plane of the gyratory motion induced by the weight I5. These planes are, of course, perpendicular to the axis of the casing I0. More specically, the desired action of the connectors is obtained when the shape of the connectors is such that the moment of inertia of the cross-sectional area of each connector, just described, about a neutral bending axis parallel to the cutting edge blade I3 exceeds by a substantial amount the moment of inertia of the same area about a neutral bending axis perpendicular to the cutting edge. Each neutral bending axis extends through that central portion of the connector which is unstressed by bending forces acting in a direction perpendicular to the axis. In the preferred construction, best illustrated in Fig. 3, each connector 30 is shaped to have a cross-section which is elongated in a direction transverse to the blade to give the connector the characteristics just described.

In order to protect the rubber connectors 3i) against undue strain, for example, when winding up the spring motor, a loose mechanical interlock is provided for preventing undue separation ofthe guard member i4 from the bed 22. In'the present instance, each of the end plates 29 of the guard member It is formed with inwardly projecting points or lugs 34 which are loosely dis-L posed within longitudinal grooves 35 formed in the outer sides of the ilanges 2e on the bed 22.

The lugs 313 do not interfere with relative longi tudinal reciprccation between the guard member I4 and the bed 22, but serve to limit relative angular displacement between these parts and relative axial separation thereof so as to prevent excess flexure of the rubber.

The rubber connectors 36 provide a strong and secure support for the floating guard member N.

They are simple and inexpensive to produce and assemble since they do notnecessitate precisiony machine work and tting nor delicacyrin handling. They are not subject to breakage ordisplacement out of desired position. In addition,`

they are not susceptible, as are" metallic springs,-y

of being bent out of shape orotherwise injured by excessive iexure and thereby rendered inefffective or ineilicient. Because of the mass deiiection pressure which is stored therein, they serve' to improve the reciprocatory cutting action by with an elongated casing enclosing power operable means tending to impart a gyratory motion to one end thereof, a rectangular bedand overlying shoe adapted to clampfan elongated razor blade therebetween and centrally secured crosswise-to said end of said casing, said bed having* end yflanges on the underside extending transversely thereof, a rectangular frame constituting a guard member extending freely about said end and underlying said bed, said frame having end plates normally disposed in edge-to-edge alinement with said anges and spaced therefrom by a slight clearance, and two flat rubber strips molded againsttheinner surfaces of said angesv and plates Vwhereby to provide a yieldable con' nection betweenisaid bed and guard member.

2. In a power driven razor, in combination with an elongated casing enclosing power operable means tending to impart a gyratory motion to one end thereof, a rectangular. bed and overlying shoe adapted to clamp an elongated. razor blade therebetween and centrally secured cross-` Wise to said end of said casing, said bed having end flanges on the underside extending transversely thereof. a rectangular frame constituting a guard member extending freely about said end and underlying said bed, said frame having end plates normally disposed in edge-to-edge alinement with said flanges and spaced therefrom by a slight clearance, and two flat rubber strips molded against the inner surfaces of said flanges and plates whereby to provide a yieldable connection between said bed and guard member, the underside of said bed being formed with transverse grooves immediately inside of said flanges, and said rubber strips being also inset and molded at their outer longitudinal edges in said grooves.

3. In a power driven razor, in combination with an elongated casing enclosing power operable means tending to impart a gyratory motion to one end thereof. a rectangular bed and overlying shoe adapted to clamp an elongated razor blade therebetween and centrally secured crosswise to said end of said casing, said bed having end anges on the underside extending transversely thereof, a rectangular frame constituting a guard member extending freely about said end and underlying said bed, said frame having end plates normally disposed in edge-to-edge alinement with said :danges and spaced therefrom by a slight clearance, and two :dat rubber strips molded against the inner surfaces of said flanges and plates whereby to provide a yieldable conwith an elongated casing enclosingvpower operable means tending to impart a gyratory motion to one end thereof, a rectangular bed and overlying shoe adapted to clamp an elongated razor blade therebetween and centrally secured crosswise to said end of said casing, said bed having end flanges on the underside extending transversely thereof, a rectangular frame constituting a guard member extending freely about said end and underlying said bed, said frame having end plates normally disposed in edge-to-edge alinement with said flanges and spaced therefrom by a slight clearance, two flat rubber strips molded against the inner surfaces of said anges and plates whereby to provide a yieldable connection between Vsaid bed and guard member, depending longitudinal marginal flanges on the underside of said bed and formed with recesses in their outer side surfaces, and upwardly and inwardly extending lugs on the ends of said end plates projecting loosely into said recesses to limit relative twisting or separating movement between said bed and guard member except longitudinally of said bed.

RUSSELL P. I-IARSIfIBERGER.

REFERENCES CITED The following references are of record in the file of -this patent:

UNITED STATES PATENTS Number Name Date 2,166,987 Rand June 6, 1939 2,301,552 La Cell Nov. 10, 1942 2,362,998 Harshberger Nov. 21, 1944 

